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Investigators looking at appliances in Ind. blast

  • Frank Rojas, an employee of Bolls Heating and Cooling, clean and checks a gas furnace Tuesday, Nov. 13, 2012, in Indianapolis. An Indianapolis explosion that killed two people and decimated a neighborhood shows some signs that aren't typical of a natural gas explosion cause by an appliance but still could have been tied to a faulty furnace if conditions were right, experts said Tuesday. (AP Photo/Darron Cummings)

    Frank Rojas, an employee of Bolls Heating and Cooling, clean and checks a gas furnace Tuesday, Nov. 13, 2012, in Indianapolis. An Indianapolis explosion that killed two people and decimated a neighborhood shows some signs that aren't typical of a natural gas explosion cause by an appliance but still could have been tied to a faulty furnace if conditions were right, experts said Tuesday. (AP Photo/Darron Cummings)

  • Utility workers, and investigators stand outside destroyed homes on Fieldfare Way in the Richmond Hills subdivision Monday, Nov. 12, 2012. An explosion, originating on Fieldfare Way, destroyed or damaged as many as 80 structures in the subdivision late Saturday night November 10, 2012. (AP Photo/The Indianapolis Star, Joe Vitti)

    Utility workers, and investigators stand outside destroyed homes on Fieldfare Way in the Richmond Hills subdivision Monday, Nov. 12, 2012. An explosion, originating on Fieldfare Way, destroyed or damaged as many as 80 structures in the subdivision late Saturday night November 10, 2012. (AP Photo/The Indianapolis Star, Joe Vitti)

  • Monserrate Shirley, talks with a reporter and photographer about her home in Indianapolis, Tuesday, Nov. 13, 2012. Shirley's home was one of two of the main homes destroyed by an explosion of unknown origin on Saturday night. An owner of the house believed to be at the center of the explosion has said the home's furnace had been having problems, but his estranged wife, Monserrate Shirley, said the furnace was fine. (AP Photo/The Star, Robert Scheer)

    Monserrate Shirley, talks with a reporter and photographer about her home in Indianapolis, Tuesday, Nov. 13, 2012. Shirley's home was one of two of the main homes destroyed by an explosion of unknown origin on Saturday night. An owner of the house believed to be at the center of the explosion has said the home's furnace had been having problems, but his estranged wife, Monserrate Shirley, said the furnace was fine. (AP Photo/The Star, Robert Scheer)

  • Monserrate Shirley, talks with a reporter and photographer about her home in Indianapolis, Tuesday, Nov. 13, 2012. Shirley's home was one of two of the main homes destroyed by an explosion of unknown origin on Saturday night. An owner of the house believed to be at the center of the explosion has said the home's furnace had been having problems, but his estranged wife, Monserrate Shirley, said the furnace was fine. (AP Photo/The Star, Robert Scheer)

    Monserrate Shirley, talks with a reporter and photographer about her home in Indianapolis, Tuesday, Nov. 13, 2012. Shirley's home was one of two of the main homes destroyed by an explosion of unknown origin on Saturday night. An owner of the house believed to be at the center of the explosion has said the home's furnace had been having problems, but his estranged wife, Monserrate Shirley, said the furnace was fine. (AP Photo/The Star, Robert Scheer)

  • Demolished vehicles sit in a destroyed attached garage at a home on Fieldfare Way in the Richmond Hills subdivision in Indianapolis, Monday Nov. 12, 2012. An explosion, originating on Fieldfare Way, destroyed or damaged as many as 80 structures in the subdivision late Saturday night Nov. 10, 2012. Investigators working to determine the cause of a deadly explosion that rocked an Indianapolis subdivision are looking at gas meters and pipelines as possible culprits, but a homeowners’ suggestion that his faulty furnace could be to blame is drawing skepticism from at least one expert.  (AP Photo/The Indianapolis Star, Joe Vitti)

    Demolished vehicles sit in a destroyed attached garage at a home on Fieldfare Way in the Richmond Hills subdivision in Indianapolis, Monday Nov. 12, 2012. An explosion, originating on Fieldfare Way, destroyed or damaged as many as 80 structures in the subdivision late Saturday night Nov. 10, 2012. Investigators working to determine the cause of a deadly explosion that rocked an Indianapolis subdivision are looking at gas meters and pipelines as possible culprits, but a homeowners’ suggestion that his faulty furnace could be to blame is drawing skepticism from at least one expert. (AP Photo/The Indianapolis Star, Joe Vitti)

  • Utility workers, and investigators stand outside destroyed homes on Fieldfare Way in the Richmond Hills subdivision Monday, Nov. 12, 2012. An explosion, originating on Fieldfare Way, destroyed or damaged as many as 80 structures in the subdivision late Saturday night November 10, 2012. (AP Photo/The Indianapolis Star, Joe Vitti)

    Utility workers, and investigators stand outside destroyed homes on Fieldfare Way in the Richmond Hills subdivision Monday, Nov. 12, 2012. An explosion, originating on Fieldfare Way, destroyed or damaged as many as 80 structures in the subdivision late Saturday night November 10, 2012. (AP Photo/The Indianapolis Star, Joe Vitti)

  • Citizens Energy workers continue their investigation Monday afternoon Nov. 12, 2012 by digging into the front sidewalk looking for possible explanation into the explosion of a house in Indianapolis. The search for what caused a massive, deadly explosion that rocked an Indianapolis neighborhood turned to natural gas Monday, with officials checking gas lines and a homeowner saying a problem furnace could be to blame. (AP Photo/WTHR Chopper 13/The Indianapolis Star, Matt Kryger) NO SALES

    Citizens Energy workers continue their investigation Monday afternoon Nov. 12, 2012 by digging into the front sidewalk looking for possible explanation into the explosion of a house in Indianapolis. The search for what caused a massive, deadly explosion that rocked an Indianapolis neighborhood turned to natural gas Monday, with officials checking gas lines and a homeowner saying a problem furnace could be to blame. (AP Photo/WTHR Chopper 13/The Indianapolis Star, Matt Kryger) NO SALES

  • Frank Rojas, an employee of Bolls Heating and Cooling, clean and checks a gas furnace Tuesday, Nov. 13, 2012, in Indianapolis. An Indianapolis explosion that killed two people and decimated a neighborhood shows some signs that aren't typical of a natural gas explosion cause by an appliance but still could have been tied to a faulty furnace if conditions were right, experts said Tuesday. (AP Photo/Darron Cummings)
  • Utility workers, and investigators stand outside destroyed homes on Fieldfare Way in the Richmond Hills subdivision Monday, Nov. 12, 2012. An explosion, originating on Fieldfare Way, destroyed or damaged as many as 80 structures in the subdivision late Saturday night November 10, 2012. (AP Photo/The Indianapolis Star, Joe Vitti)
  • Monserrate Shirley, talks with a reporter and photographer about her home in Indianapolis, Tuesday, Nov. 13, 2012. Shirley's home was one of two of the main homes destroyed by an explosion of unknown origin on Saturday night. An owner of the house believed to be at the center of the explosion has said the home's furnace had been having problems, but his estranged wife, Monserrate Shirley, said the furnace was fine. (AP Photo/The Star, Robert Scheer)
  • Monserrate Shirley, talks with a reporter and photographer about her home in Indianapolis, Tuesday, Nov. 13, 2012. Shirley's home was one of two of the main homes destroyed by an explosion of unknown origin on Saturday night. An owner of the house believed to be at the center of the explosion has said the home's furnace had been having problems, but his estranged wife, Monserrate Shirley, said the furnace was fine. (AP Photo/The Star, Robert Scheer)
  • Demolished vehicles sit in a destroyed attached garage at a home on Fieldfare Way in the Richmond Hills subdivision in Indianapolis, Monday Nov. 12, 2012. An explosion, originating on Fieldfare Way, destroyed or damaged as many as 80 structures in the subdivision late Saturday night Nov. 10, 2012. Investigators working to determine the cause of a deadly explosion that rocked an Indianapolis subdivision are looking at gas meters and pipelines as possible culprits, but a homeowners’ suggestion that his faulty furnace could be to blame is drawing skepticism from at least one expert.  (AP Photo/The Indianapolis Star, Joe Vitti)
  • Utility workers, and investigators stand outside destroyed homes on Fieldfare Way in the Richmond Hills subdivision Monday, Nov. 12, 2012. An explosion, originating on Fieldfare Way, destroyed or damaged as many as 80 structures in the subdivision late Saturday night November 10, 2012. (AP Photo/The Indianapolis Star, Joe Vitti)
  • Citizens Energy workers continue their investigation Monday afternoon Nov. 12, 2012 by digging into the front sidewalk looking for possible explanation into the explosion of a house in Indianapolis. The search for what caused a massive, deadly explosion that rocked an Indianapolis neighborhood turned to natural gas Monday, with officials checking gas lines and a homeowner saying a problem furnace could be to blame. (AP Photo/WTHR Chopper 13/The Indianapolis Star, Matt Kryger) NO SALES

Investigators in the Indianapolis explosion that killed two people and decimated a neighborhood believe natural gas was involved and are focusing on appliances as they search for a cause, a city official said yesterday.

Indianapolis Homeland Security Director Gary Coons made the announcement after the National Transportation Safety Board said investigators had found no leaks in the gas main or pipes leading into the house that exploded. The explosion Saturday leveled two homes and left dozens more uninhabitable.

Coons said his “investigators believe natural gas is involved” and were “recovering the appliances from destroyed homes to help determine the cause.”

“Based on the NTSB statement, our focus is on the houses and appliances,” Coons said in a statement.

The blast showed some signs that aren’t typical of a natural gas explosion caused by an appliance, experts said, but it still could have been tied to a faulty furnace – if conditions were right.

An owner of the house believed to be at the center of the explosion has said the home’s furnace had been having problems. But his estranged wife, Monserrate Shirley, told the Associated Press yesterday that the thermostat was replaced recently, correcting a problem heating the home. Shirley, who lived in the house but wasn’t there during the explosion, said she had smelled a strange odor outside before the blast, but didn’t know if it was natural gas.

But experts said homeowners shouldn’t be worried that their furnaces are about to explode.

John Erickson, vice president of the American Public Gas Association, said it would take a far more serious malfunction than just a pilot light going out. And forensic mechanical engineer Richard Schreiber, with Intertek AIM in Sunnyvale, Calif., said it’s usually immediately evident whether a blast was caused by natural gas.

Schreiber said that with explosions involving solids such as dynamite, the center of the blast is tightly concentrated, creating a crater. Explosions caused by flammable gas are typically spread out over a wide area, such as throughout the interior of a building filled with leaking gas, he said.

“If the investigators don’t find a crater, that pretty much means it was something other than a solid phase explosion,” he said, meaning it’s likely to be a gas explosion. But he also said such investigations can still take time.

More than a dozen home explosions linked to natural gas have occurred in the last two years. Many involved a single home, though more devastating blasts tied to pipelines have been reported, including a 2011 explosion in Allentown, Pa., that killed five people and a blast in 2010 in San Bruno, Calif., that killed eight people and destroyed 38 homes. A gas leak in a Colorado home last month sparked an explosion that sent five people to a hospital and damaged several homes.

Erickson said more gas blasts are caused by appliances than by pipelines, but even those are rare. Technological advances such as microprocessors and the switch from pilot lights to electronic ignition have made appliances safer, he said. Gas companies have been required since 1970 to add a chemical that smells like rotten eggs to the odorless gas to make leaks easier to detect.

Erickson also said a temperature sensor on furnaces is supposed to prevent a gas valve from opening if the pilot light is out. But if that device were to malfunction – or if a gas pipe in the house were to break – it could allow a significant gas buildup and cause a big explosion, he said.

“To get a house to fill up with gas would take a pretty major leak. It would be more than just a pilot light that went out and the gas continued to flow,” Erickson said.

He said that between 60 and 80 cubic feet of natural gas could flow out of a defective furnace or broken pipe every hour, rapidly filling a home or building.

The head of a company that does furnace repairs in Indianapolis said the blast’s size made it unlikely that it had been caused by a leaking appliance.

“One hell of a lot of gas had to be leaking out . . . and that’s typically not symptomatic of a furnace problem,” said Sergei Traycoff, president of Bolls Heating and Cooling. “I’ve never heard of one causing this big a blast.”

Consumers can best protect themselves by having their furnaces inspected regularly, he said.

Erickson said it was odd that the blast apparently flattened two homes side by side. Generally, if a house explodes, it will knock out the wall of the home next door, but not level it, he said. For that to occur, both homes would virtually have to have gas leaks that ignited at the same time, he said.

Schreiber added that gas explosions create an intense wave of heat that can ignite surrounding homes.

“It goes very quickly. It’s just a ‘whoosh,’ you know, like if you have a gas stove or a grill where it doesn’t ignite immediately and there is a whoosh sound. That’s kind of what happens here, but at a much, much greater level. It’s a quick event, not a lingering thing.”

The NTSB said the natural gas lines inside the house would be under the oversight of the utility or the state. Citizens Energy spokeswoman Sarah Holsapple said the utility had found no leaks in its underground facilities in the neighborhood; the Indiana Utility Regulatory Commission had no comment yesterday.

Glenn Olvey, 52, isn’t sure what caused the blast that wrecked his home and vehicles. But he knows his family is fortunate to be alive. The blast hurled Olvey several feet and trapped him, his wife and one of their two teenage daughters when their roof collapsed.

“I have been through car accidents, I’ve been through motorcycle accidents, I’ve been through tornadoes. I have never, never had anything like that,” he said.

Olvey said he and his wife, Gloria, have struggled knowing that the explosion killed Jennifer and John Longworth, just two doors down.

“We’re alive for a reason,” he said. “What it is, I don’t know.”

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